Strap for Fifty Fathoms Automatique Grande Date Titanium / Black / Black NATO

The lug width of this model is 23mm, a non-standard dimension requiring specific sourcing. Blancpain engineered this width to optimise ergonomic balance on a 45mm titanium case, preventing lateral tilt. To measure accurately, use a digital calliper within the lug seat: the distance between both lug walls must read exactly 23mm.

Selection depends on intended use: Nile alligator in dark tones delivers explorer elegance and visible patina development; vegetable-tanned calf introduces natural stratification and texture that deepens over time; natural or synthetic rubber straps represent the technical choice for saltwater and humid environments. Avoid shell cordovan if your Fifty Fathoms will frequent seawater regularly, as it suffers accelerated oxidation.

The Fifty Fathoms uses a standard spring bar system. Employ a dedicated spring bar tool: position the curved tip into the spring mechanism's recess, apply gentle inward pressure to retract the pin, then withdraw the lug from its seat. Repeat on the opposite lug. To fit the new strap, align the leather's holes with the case lugs and push the spring pin inward until you feel the locking click.

Yes, provided they respect the exact 23mm lug width specification. Milano Straps maintains a dedicated collection for models with this dimension, offering alligator, calf, rubber, and canvas in multiple finishes and colourways. We recommend verifying the strap's lug width is precisely 23mm as measured within the lug seat to prevent play or forcing.

Durability depends on material choice and environmental exposure. Vegetable-tanned alligator resists approximately 3–5 years of daily wear in temperate climates, shortening to 1–2 years in unprotected saltwater environments. Vegetable-tanned calf shows similar lifespan. Natural rubber straps maintain structural integrity 5–7 years; synthetic alternatives exceed 10 years. Milano Straps provides 18-month warranty on manufacturing defects: to extend useful life, remove the strap during extended periods of non-use and store in a dry environment.